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沂水无核软枣是沂水县80年代从0．5万株无核软枣中筛选培育的优良品系，经自发扩繁与近年开发，现已发展到200hm2多，年产100万kg。该优系平均单果重5．3g，栽后第二年见花，第三年平均株产6．5kg，早期丰产，耐瘠耐旱，是青石山区的良好生态经济型树种。
Yishui non-nuclear jujube Yishui County in the 80’s from 0.5 million non-nuclear jujube in screening and breeding of fine strains, the spontaneous expansion and development in recent years, has now developed to more than 200hm2, with an annual output of 1000000 kg. The average weight of the excellent system is 5.3g, the second year after planting see flowers, the average annual yield of 6.5kg in the third year, early high yield, drought-resistant barren, is a good eco-economic Qingshi mountain species.